Sumner Seibert, M.D.
Orthopaedic Surgery Physician · Antioch, CA
Sumner Seibert, M.D. is an orthopaedic surgery physician with a practice address in Antioch, California, and NPI 1255350534, issued on Jul 18, 2006. Check the license (California G16830, as entered in NPPES) on the Medical Board of California; the federal record below is the public data PlainDoctor holds for this provider.
- Name
- Sumner Seibert
- Credential
- M.D.
- Primary taxonomy
- Orthopaedic Surgery Physician 207X00000X
- License number
- G16830 CA
Self-reported in NPPES; status is on the state search - Practice location
- 3903 Lone Tree Way, Antioch, CA 94509
- Phone
- (925) 754-5254
- Enumerated
- Jul 18, 2006
- Record last updated
- Jul 8, 2007 (not updated in 19 years: call before relying on the address or phone)
- Entity
- Type 1 · individual
8 nearest orthopaedic surgery physician records → All 2,276 in California → Look up another NPI →
Also registered at 3903 Lone Tree Way
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Michael Ditmars, MDSurgery Physician1265440101
- Naoko Ikeda, DOFamily Medicine Physician1952403909
- Jenny Jew, M.D.Gastroenterology Physician1356504476
- Hamidreza Khonsari, M.D.Family Medicine Physician1306874714
- Lauren Shirvanee, D.O.General Practice Physician1033447222
- Dennis Zai, MDGastroenterology Physician1740253350
Verify Sumner Seibert in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license G16830Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Sumner Seibert among 2,276 orthopaedic surgery physician records in California
Sumner Seibert, M.D. is one of 2,276 orthopaedic surgery physician records with a practice address in California. 74% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does not. Its NPI, issued in 2006, is newer than 10% of them.
- NPI issued2006 · 10% of these records are older, 46% newer
- In a Medicare fileNo · 74% of these records are
- In the CMS Doctors and Clinicians fileNo · 59% of these records are
- Record last updated2007 · 66% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207X00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Orthopaedic Surgery Physician providers in California
There are 2,276 orthopaedic surgery physician records in California. No Medicare prescribing, quality score, industry payment or hospital affiliation is published for this NPI.
All 2,276 in California → Every provider in Antioch → Orthopaedic Surgery Physician nationwide →
The 8 orthopaedic surgery physician records with the nearest ZIP codes
- Torsten Jacobsen, M.D.Antioch, CA 945091275761520
- H Jaffin, MDAntioch, CA 945091770579625
- Denise Romero, M.D.Antioch, CA 945091194922542
- Bala Marar, M.DBenicia, CA 945101801968466
- William Bevan-Thomas, MDAlamo, CA 945071356610968
- Connor ByrneBrentwood, CA 945131144782541
- Jonathan Ochoa, MDBrentwood, CA 945131215424254
- Richard Nolan, M DAlameda, CA 945011073588836
Common questions
What is Sumner Seibert, M.D.'s NPI number?
Sumner Seibert, M.D.'s National Provider Identifier (NPI) is 1255350534, issued on Jul 18, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Sumner Seibert, M.D. located?
The NPPES record lists a practice address at 3903 Lone Tree Way, Antioch, CA, 94509. Phone: (925) 754-5254. Providers update this record themselves, so call before visiting.
How can I verify Sumner Seibert, M.D.'s license?
NPPES lists California license number G16830, as entered by the provider. Search the Medical Board of California at https://www.mbc.ca.gov/License-Verification/default.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.